Removing featured image function from header – bpdefault

Hello, I’m using the latest BP default theme with BP-Columns child theme. I need to remove the function that imposes the post’s Featured Image on the header. I have investigated header.php in bp-default and can’t see it.

BP-Columns doesn’t have a child header.php.

Where is the code that tells the theme to look for a Featured Image and what does it look like?